linux-kernel - Re: [patch -next] x86, microcode, AMD: signedness bug in generic_load

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Sun, 20 Feb 2011 16:09:50 +0300
From:	Dan Carpenter <error27@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Andreas Herrmann <andreas.herrmann3@....com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Borislav Petkov <borislav.petkov@....com>,
	"maintainer:X86 ARCHITECTURE..." <x86@...nel.org>,
	"open list:AMD MICROCODE UPD..." <amd64-microcode@...64.org>,
	open list <linux-kernel@...r.kernel.org>,
	kernel-janitors@...r.kernel.org
Subject: Re: [patch -next] x86, microcode, AMD: signedness bug in
 generic_load_microcode()

On Sun, Feb 20, 2011 at 02:02:14PM +0100, Ingo Molnar wrote:
> 
> * Dan Carpenter <error27@...il.com> wrote:
> 
> > install_equiv_cpu_table() returns type int.  It uses negative error
> > codes so using an unsigned type breaks the error handling.
> 
> How did you notice this btw - did GCC throw a warning?
> 

It's a smatch warning.

arch/x86/kernel/microcode_amd.c +256 generic_load_microcode(12)
	warn: unsigned 'offset' is never less than zero.

regards,
dan carpenter
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/